10 Duets for Recitals, Concerts, and Contests. Arranged by Patrick M. Liebergen, Earlene Rentz, Russell Robinson, and Ruth Elaine Schram. Book; CD; Duet or Duo; Masterworks; Vocal Collection. For Two Series. Masterwork Arrangement; Sacred; Secular. 64 pages. Published by Alfred Music

(8 Standards from the Baroque, Classical, and Romantic Periods). Edited by and arr. Patrick M. Liebergen. For Voice. Book; Duet or Duo; Masterworks; Vocal Collection. Masterwork Arrangement; Sacred; Secular. 88 pages. Published by Alfred Music

Edited by Patrick M. Liebergen. For Voice. Vocal Collection. For Two Series. Masterwork; Sacred; Secular. Book and CD. 96 pages. Published by Alfred Publishing.